a:5:{i:0;s:7:"gradeid";i:1;s:10:"grade_name";i:2;s:9:"parent_id";s:3:"_pk";s:7:"gradeid";s:5:"_type";a:3:{s:7:"gradeid";s:7:"int(11)";s:10:"grade_name";s:8:"char(10)";s:9:"parent_id";s:6:"int(3)";}}